Okay, my current WIP has two characters who are in a serious relationship. However, they are both astronauts who are part of a team to stay on Mars for 2 years. And given what I understand about relationships within work environments in general, my thought was to make it so they don't express or display much, if anything, beyond a normal friendship. at least not until the end, maybe. My problem is that I'm unsure how I could write it. Obviously I'd like to show that they have this special relationship, but at the same time they'd have to be professional about when and how they could be affectionate. Anyone have any suggestions? Is it realistic for a couple to be professional about their relationship, non-stop for over 2 years?